The B303 is a higher rpm cam than the E303 with more duration 224*@.500 vs 220*@.500 for the E303.
The B303 seems to respond well to 1.7:1 roller rockers, but I don't think unless you do a heavy port to the GT40p's you'd need that.
Keep the combo matched, and the wild cams and heads out of the equation and your speed density system will do just fine with you adjusting the fuel pressure. Until you hit 350hp, you will not need 24lb injectors. If you get there, again, just adjust the fuel pressure and SD will run fine with them.
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